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In Mac OS, that looks like the EDI stored the handle of current instance of one class. Is it right? I hope to call other class methods via it.
Even though I checked Intel 64bit manual and AMD64 ABI interface, there is no clear answer about it.
It would usually be in RDI, as it’s treated as the first parameter to a function, and under the ABI, that parameter is passed in RDI.
caveat: If the return value from the method is non-trivial (i.e. it’s a temporary allocated in stack) then there is an additional 1st parameter passed, which is the address of that temporary, and which comes before the
thispointer.